Here's the deal. I'll start out by describing an easily-recognizable quality of a firearm. If you know what gun I'm talking about, reply and say so, and then keep the game going by posting your own description.

My first response was a Blunderbuss but then I got to thinking that was more a Thanksgiving thing, with the pilgrims and all.

You're talking about air rifles. the Red Ryder BB Gun in the Christmas movies, and I didn't even know they HAD air rifles in the time of Lewis & Clark but apparently they did, a Girandoni air rifle, at 51 caliber.

Wild.

This gun's purposefully sloppy-fitting. So sloppy, in fact, that a handful of sand doesn't affect the operation at all.

I couldn't think of this at first, then realized I was focusing on Allied weapons. Once I turned my thoughts to the Axis, MG42 immediately came to mind!
I was going to answer a few days ago, but have been unable to come up with a good question of my own. so I'll go with a cheap one:

No answers? I was ashamed to post that one, thinking it was far far too easy. It's a movie quote. Someone fires a shotgun, and says that you have to "strain the remains for fingerprints" to which the other person names his weapon and says his will remove fingerprints.